DO NOT MERGE Revert "Enable SD card encryption policy when emulated"
This reverts commit 4f9b59673d0fd089cfb4b4c8e0210192394929a9.
The introduction of proper SD cards breaks the invariant that "external"
storage can be encrypted. Unfortunately, this means that accounts with
that policy bit set will have to be removed for now.
Bug: 4466311
Change-Id: I1770c01115fc6a3bb54fe58d5e9f6a32f39b0005